Boiler Service
BOILER REPAIR, MAINTENANCE & REPLACEMENT IN NORTH LOUISIANA
Have a hot-water or steam boiler? We repair, service, and replace them across North Louisiana — pressure, circulator, and safety-control work, flat-rate before we start.
4.9 · 4,400+ reviews
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4.9★ on Google
4,400+ reviews
24/7 Emergency
60–90 min dispatch
Licensed & insured
LA Master Plumber #1874
North Louisiana
Ruston to Shreveport
Flat-rate pricing
Quoted before we start
Overview
Straight Talk About Boilers in North Louisiana
Boilers are less common in North Louisiana than furnaces and heat pumps — our mild winters mean most homes here were built with forced-air heat. But plenty of older homes, custom builds, and radiant-heat systems around Ruston, Monroe, West Monroe, and Shreveport run on a hot-water or steam boiler, and when one goes down, you need a licensed crew that actually knows the equipment. That's us.
Mark Johnson & Sons repairs, maintains, and replaces residential boilers. Because we're a combined plumbing and heating company, boiler work sits right in our wheelhouse — it's as much about water, pressure, and piping as it is about heat. The tech who shows up is on our payroll, no subcontractors, and every quote is flat-rate, given before any work starts. The service call is waived when you have us do the repair.
What we service
- Hot-water (hydronic) boilers — gas and electric, cast-iron and condensing, feeding radiators, baseboard, or radiant-floor loops
- Steam boilers — the older systems still found in some North Louisiana homes
- Circulation and pressure components — circulator pumps, expansion tanks, air separators, fill and pressure-reducing valves
- Controls and safeties — aquastats, relief valves, low-water cutoffs, gas valves, and ignition controls
Repair vs. replace
If the boiler is under 15 years old and the repair is reasonable relative to a new unit, repair usually makes sense — circulators, expansion tanks, and controls are routine, affordable fixes. Once you're facing a cracked heat exchanger, a badly corroded block, or repeated failures on a 20-plus-year-old unit, replacement is the smarter money. We'll tell you honestly which side of that line you're on and quote both flat-rate.
What Mark Johnson & Sons does differently
Most heating companies around here won't touch a boiler because they don't understand the water side. We do. We chase pressure problems to the actual source instead of just topping off the fill valve, bleed trapped air so every zone heats, and verify the safety controls cycle correctly before we leave. Because boilers are rare locally, parts sometimes have to be ordered — but we carry common circulators, expansion tanks, and controls and get you heat back as fast as anyone can. On a replacement we handle the near-boiler piping, the permit, and old-unit removal in-house, so you deal with one crew from start to finish.
Ask about our Classic Membership — it includes a seasonal heating tune-up tailored to your boiler plus 15% off any repair, which is the cheapest way to keep a boiler reliable and safe.
Free quote
Flat-rate boiler quote
Tell us the boiler type, its age, and what it's doing. We'll come diagnose it and give you a real number before any work starts.
4.9★
24/7
Emergency
Free
Quote
Current coupons
View all$89 OFF
Waived diagnostic with any boiler repair
Service call credited back when you approve the repair.
Expires 12/31/2026
15% OFF
Repairs with Classic Membership
Membership is $189/year. Discount applies to HVAC & plumbing repairs.
Expires 12/31/2026
$400 OFF
New boiler installation
Qualifying boiler replacement. Must mention at booking.
Expires 12/31/2026
Mention coupon when booking. One offer per household.
Warning signs
Signs Your Boiler Needs Attention
Boilers usually give warning before they fail outright. If you're seeing any of these, get it checked before a cold snap.
No heat or weak heat to the radiators or floor loops
System pressure gauge reading too low or climbing too high
Banging, knocking, or gurgling sounds when the boiler fires
Water pooling or dripping around the boiler or piping
Circulator pump humming but not moving water
Pilot or burner won't stay lit, or the unit keeps locking out
Cold radiators or rooms that used to heat evenly (trapped air)
Relief valve weeping or discharging water
Boiler is 15+ years old with rising repair frequency
Licensed & local
Got a boiler? We're the plumbing-and-heating crew that knows them.
Boilers are rarer in North Louisiana, so most companies won't touch them. We do — pressure, circulator, expansion tank, and safety controls, all in-house, flat-rate.
Answered live
24/7
Across Ruston, Monroe, Shreveport, Bossier City, and North Louisiana.
The Process
How a Boiler Service Call Goes
On the truck
Professional tools, parts, and diagnostics — every call.
On-phone triage
We ask what type of boiler you have, its age, and what it's doing — no heat, a leak, odd noises, or a lockout. If there's active leaking, we roll sooner.
Full diagnostic on-site
The tech checks system pressure, the circulator pump, expansion tank, relief valve, low-water cutoff, and safety controls, then walks you through what's wrong.
Flat-rate quote
You get the repair price up front. If the boiler is a replacement candidate, we lay out honest options and real numbers before you decide anything.
Repair or service the system
Common parts — circulators, expansion tanks, relief valves, controls — we source and install. We bleed trapped air and reset pressure so the loop runs right.
Test, verify, and clean up
We fire the boiler, confirm even heat across the loop, verify the safety controls cycle correctly, and leave the equipment room clean.
Pricing
Boiler Repair & Service Cost in North Louisiana
Flat-rate, quoted before we start. Classic Membership members get 15% off repairs. After-hours emergency service is billed separately.
Boiler diagnostic / service call
Waived when you have us do the repair
Standard
$89–$129
Member · save 15%
$76–$110
Annual boiler service & safety check
Pressure, controls, bleed, and combustion check
Standard
$185–$325
Member · save 15%
$157–$276
Circulator pump replacement
The pump that moves hot water through the loop
Standard
$385–$850
Member · save 15%
$327–$723
Expansion tank replacement
When pressure swings or the tank is waterlogged
Standard
$275–$550
Member · save 15%
$234–$468
Relief valve or safety control replacement
Relief valve, aquastat, or low-water cutoff
Standard
$225–$650
Member · save 15%
$191–$553
Gas valve or ignition control replacement
When the burner won't light or the unit locks out
Standard
$450–$1,100
Member · save 15%
$383–$935
Leak repair / near-boiler re-pipe
Depends on location and amount of piping
Standard
$350–$1,200
Member · save 15%
$298–$1,020
Boiler replacement (installed)
By size and type; near-boiler piping and permit included
Standard
$6,000–$12,000
Member · save 15%
$5,100–$10,200
After-hours / emergency service
Added to the repair; +$175 and up nights, weekends, holidays
Standard
$175–$175
Member · save 15%
$149–$149
Member pricing reflects the Classic Membership 15% repair discount. Service call fees are separate.
Ranges reflect 2026 North Louisiana residential work. Steam systems, commercial boilers, and full re-pipes are quoted separately after inspection.
Classic Membership
One plan. Whole-home peace of mind.
For $189 a year, members get 15% off every HVAC and plumbing repair, two complete HVAC tune-ups, a free plumbing and drain check-up, and priority scheduling on every call.
- 15% off repairs
- Priority scheduling
- 2 HVAC tune-ups/yr
- After-hours discounts
- $25 savings certificate
- Guaranteed flat-rate
Classic Membership
$189/year
One flat yearly price covers your whole home — everything listed, no per-visit fees, no surprises.
Questions? (318) 319-0220
Cancel anytime · 1-yr min
Compare
Boiler (Hydronic) vs. Forced-Air Furnace
The two ways to heat a home with gas. Most North Louisiana homes use forced air, but a boiler delivers a different kind of comfort — here's how they compare so you know what you have and what fits.
| Feature | Boiler (Hydronic) | Forced-Air Furnace |
|---|---|---|
| How it heats | Hot water through radiators or floor loops | Heated air blown through ducts |
| Comfort feel | Even, quiet, draft-free warmth | Fast warm-up, some drafts and noise |
| Air quality | No blown dust or allergens | Filters air, can stir up pollen |
| Install / replace cost | $6,000 – $12,000 installed | $3,800 – $8,500 installed |
| Cooling | None — needs a separate AC system | Shares ductwork with central AC |
| Best for | Radiant homes, even-heat comfort, no ducts | Most LA homes, pairs with AC, lower cost |
FAQ
Boiler Service FAQs
No — forced-air furnaces and heat pumps are far more common here because of our mild winters. But older homes, custom builds, and radiant-floor systems around Ruston, Monroe, and Shreveport do run on boilers. We're one of the few local crews that service them, since boiler work is as much plumbing as it is heating.
Related services
Related Heating Services
These often come up alongside boiler work.
Radiant Heating
In-floor and radiant heating service and installation — the loops many boilers actually feed.
Furnace Repair
No-heat calls, short cycling, ignition and blower faults — gas and electric furnaces, fixed fast.
24/7 Emergency Heating
No heat on the coldest night? Licensed tech dispatched fast, any hour, any day.
Available Around the Clock
Emergency?
We answer 24/7.
Burst pipe, water heater out, sewer backup? Real plumbers pick up — no answering machines. Mark Johnson & Sons Plumbing serves North Louisiana any time, day or night.
LA Master Plumbing #1874 · Backflow Cert #28131 · Master Natural Gas Fitter #LMNGF9062 · State Contractors #35794